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Old 04-21-2016, 11:45 PM   #1
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Bearings/Axles

Purchased trailer used several years ago. I grease bearings manually every year. I noticed these burn/rust marks every year. I sand the marks off with very fine emerycloth but the marks come back every year. I would replace all bearings and races but the axles have these marks. Any clue as to what it's from....? I was told trailer sat alot very little use.
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Old 05-04-2016, 01:02 PM   #2
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Maybe from heat, all though usually bluish in color, are your brakes running hot?
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Old 05-04-2016, 01:12 PM   #3
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It may be from rust inside the wheel bearings. You could try cleaning the bearings in a solvent but I would try replacing a bearing set for a wheel and see if that fixs the problem.
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Old 05-04-2016, 01:24 PM   #4
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Suspect bearing race may be turning on spindle. I have prick punched a few spindles to tighten the race so it won't spin. Should not be rust with all the grease on it. Check your inner bearing very closely for pitted rollers or race.
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Old 06-04-2017, 02:40 AM   #5
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Replaced all bearings a year ago. Same marks noted during my bearing inspection/repack.
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Old 06-04-2017, 07:25 AM   #6
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That high part of the spindle is where the seal rides. I do not think the bearing rides on that part. You can check that out by sliding the bearing on the spindle and seeing where it stops. If that is the case, those marks likely just come from the seal as it turns on the spindle.
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Old 06-04-2017, 08:05 AM   #7
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That might explain the axle, but not the rust on the bearing.

Do the hubs get hot when you pull the trailer?
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Old 06-05-2017, 01:57 PM   #8
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Judging by your eyeball in the first shot, it is on the bottom of the spindle and on the portion of the bearing that is lowest. It appears to be fretting. This is usually the result of a bad fit from the race to the spindle and contamination of some sort. (Most likely water in this case.) (FWIW, Orange means aerobic (with O2), and black is anaerobic, (without O2) both types will result in the same problems.) Scuffing it down with crocus cloth will only make the fit worse and will exacerbate the problem. Replacement of the parts with clean spindles and bearings with correct dimensions is the only way to eliminate it.
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Old 06-06-2017, 09:39 PM   #9
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That sounds expensive to replace spindles? Can new spindles be welded on vs new axles? Cost one vs other??
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Old 06-06-2017, 09:42 PM   #10
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Quote:
Originally Posted by m35a2 View Post
That might explain the axle, but not the rust on the bearing.

Do the hubs get hot when you pull the trailer?


Temps seem normal; I am just concerned about the marks.
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